Individual Flueing Of Internal Units - Rinnai Demand Duo Installation Manual

Individual flueing of internal units

Flue gases can reach temperatures up to 200 °C. The flue terminal is to terminate in
a location so as not to cause a nuisance, in accordance with AS/NZS 5601.1.
The Rinnai INFINITY internal gas hot water heaters are room sealed appliances—sealed from
the room as it takes air for combustion from the outside, and expels products of combustion
outside. No ventilation in the space where the water heater is installed is required. Each Rinnai
INFINITY water heater is flued individually.
The flueing for internal water heaters is a coaxial design. It has a stainless steel inner pipe to
discharge products of combustion and a thermoplastic outer pipe for air supply to the appliance.
Flueing options
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1. Direct flueing: For installations where the internal continuous flow unit is mounted directly
on the inside of an external wall.
2. Horizontal extension flueing: The same as direct flueing with additional pipe required due
to the longer horizontal distance.
3. Vertical straight flueing: Installations where the internal unit is flued vertically through the
roof.
4. Combination vertical and horizontal flueing: A combination of all the above.
Important
• All heaters need to be flued individually—refer separate installation guide for installing Rinnai
INFINITY gas hot water heater internal flueing
• A condensate drain tube must be fitted to HDi200* units if the vertical flue length exceeds 1.5 m
• Internal models MUST BE flued with a Rinnai approved flue system
* EFi units have an inbuilt system to drain condensate
10 | Demand Duo CFHW with storage backup installation guide: 12583-B
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